<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background-color: #f60;
        }
    </style>
</head>
<body>
    <div id="app">hello world</div>
</body>
<script>
    const baby = '1'
</script>
</html>